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For the exam, remember that Task Manager can show real-time information about the CPU, RAM, and virtual memory, but the measurements are fairly limited. To collect more detailed information, use the Performance console. The Performance console also allows you to collect performance data over a longer period.
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How to Change the Base Priority of a Running Process
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Changing the base priority of a process determines how much processor time Windows XP Professional devotes to the process compared with other processes. By default, most processes run at a base priority of Normal. However, you can change the base priority for a process by using the following steps: 1. In Task Manager, on the Processes tab, click the View menu and then click Select Columns. 2. In the Select Columns dialog box, select Base Priority and then click OK. The Base Priority column now appears in the Task Manager window. 3. Right-click the process for which you would like to change the base priority. 4. On the shortcut menu that appears, point to Set Priority, and then select one of the following commands:
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Realtime High AboveNormal Normal BelowNormal Low
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19-6
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Monitoring and Optimizing System Performance
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Caution
You should change the priority of processes only when there is a process that needs priority over (or is less important than) other running processes; even then, you should try to use only the AboveNormal, Normal, and BelowNormal levels. Setting a process at too high a base priority (such as RealTime) can consume enough system resources that other vital processes cannot function properly.
How to Set Processor Affinity
Windows XP Professional can support two processors running on the same computer. When two processors are installed, Windows XP Professional does a good job of assigning processes to processors based on need. However, you can assign a particular process to a specific processor. (This is referred to as assigning processor affinity to a process; of course, it is available only on computers with two processors or on computers with a hyperthreaded processor in which multiple processes can run simultaneously on one processor.) To assign a process to a processor, use the following steps: 1. In Task Manager, on the Processes tab, right-click a process and then click Set Affinity. 2. In the Processor Affinity dialog box, select the processors on which the process should be allowed to run. By default, both processors (CPU 0 and CPU 1) are selected for a processor.
Caution
Controlling processor affinity can improve performance by reducing the number of processor cache flushes that occur as threads move from one processor to another. This might be a good option for dedicated file servers. However, be aware that dedicating a program to a particular processor might not allow other program threads to migrate to the leastbusy processor.
How to Monitor System Performance
You can use the Performance tab in the Task Manager dialog box (see Figure 19-3) to see a current overview of system performance that includes information about the CPU (or CPUs on a computer with two processors), physical memory, and virtual memory.
Lesson 1
Using Task Manager
19-7
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Figure 19-3 The Performance tab provides real-time performance data about the CPU, RAM, and virtual memory.
Table 19-2 describes the fields that are displayed by default on the Performance tab in Task Manager.
Table 19-2
Performance Tab Fields
Description The percentage of time that the processor is busy. If this graph displays a high percentage continuously (and not when there is an obvious reason, such as a big application), your processor might be overloaded. If your computer has two processors, two graphs are shown. If this value runs continuously over 80 percent, you probably see a noticeable improvement in performance if you upgrade your processor. The percentage of time that the processor is running a thread other than the idle thread shown over time. You can use the Update Speed command on the View menu to specify how often the values are refreshed. The High value updates about twice per second; Normal value updates once every two seconds; Low value updates once every four seconds. You can also pause the updates and update the view manually by pressing F5. This is a useful method if you want to monitor some specific activity. Note that Task Manager itself uses processor time. The more frequently you update the display, the more processor time it uses, which throws off the accuracy of whatever you are analyzing. The amount of virtual memory used (in MB). The amount of virtual memory used, shown over time. Values set using the Update Speed command affect this history as well.
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